Wedelia - Singapore Daisy
Sphagneticola trilobata also known as Wedelia and Singapore Daisy is a member of the
daisy family Asteraceae which is native to Central and South America from
Mexico to Argentina
Singapore Daisy Sphagneticola trilobata has become a major
environmental weed in many of warmer parts of the world in particular the warmer eastern parts of
Australia where it spreads rapidly climbing over and smothering low
growing vegetation. The dense ground cover it forms also inhibits natives from germinating due to lack of
space, lack of sunlight and lack of water. It grows well in most habitats from roadsides, coastal areas, bush
land, rainforest, riparian areas, wetlands and wasteland. Singapore Daisy can be very difficult to control
and can re-shoot from nodes on stems. It is mainly dispersed by human cultivation as well as through the
illegal dumping of garden clippings onto vacant land.
Singapore Daisy Sphagneticola trilobata has been declared a Category 1 invasive
weed in South Africa. In terms of the Conservation of Agricultural Resources
Act (No 43 of 1983) land occupiers and owners are legally obliged to control Sphagneticola trilobata.
Management of Singapore
The first step in the control of Singapore Daisy is
preventative that is not to plant it and to remove existing plants within the landscape. Take care when dumping
vegetation to prevent regeneration and further spread. It is advisable to put all cut or removed vegetation into
black plastic bags and leave in the hot sun for a few days to kill it before sending it to the municipal
dump. Mowing or slashing of Wedelia infested areas should be avoided because this will cause the development
of new plants. Attempting to uproot Singapore Daisy from the areas where it grows unless it covers a very small
area is pointless because it will simply re-grow from the smallest pieces of stem or roots that are left behind.
Small plants may be hand pulled, but be sure to remove roots and rhizomes.
The most effective method of eradication is by the application of herbicides to
the infested areas. The infested areas will need to be rechecked a number of times to insure that it has been
successfully eradicated, spot spray re-growth.
Large, dense populations are best sprayed with a 5% solution of Glyphosate
(Roundup®) mixed with water. Follow-up treatments should be conducted as needed with a 2% solution of glyphosate
mixed with water. Triclopyr (Garlon®) at 1-2% mixed with water is also effective in particular for smaller
infestations in grassland as triclopyr may damage but will not kill the grasses.